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Since you have ABAP and BW it would be easy to work in ECC - SLT -HANA project as you can easily learn Sql script(used in store procedure and script based Calc view ) and modeling (used in information model like attribute views , analytical views. Graphical Calc view ) .

In native hana , you would see both this kind of objects used depending on business requirements.

Sometimes you also need to write abap code in SLT in order to perform small transformations before loading into HANA.